help with surf pi, trying to make it work!!

[ApBerg]

without audio i have 0.37mA. with no Ic on i have 0.01 mA and onthe pins 6 and 8 i have -5.08 and +5.08

Looks good, check if you have on the NE5534 pin4 -5volt and on pin7 +5volt ?
You have audio after you use the tune potentiometer ? and no reaction on metal ?
Put the delay potmeter in mid position, then check if iron is detected ?

[pavlos_x]

i have NE5534 pin4 +1.89volt and on pin7 +5.08volt
i dont have audio after i use the tune potentiometer. no reaction at all, nothing.
i Put the delay potmeter in mid position, then i checked if iron is detected
but still nothing

[ApBerg]

i have NE5534 pin4 +1.89volt and on pin7 +5.08volt
i dont have audio after i use the tune potentiometer. no reaction at all, nothing.
i Put the delay potmeter in mid position, then i checked if iron is detected
but still nothing

You need to have -5v on pin 4 from the NE5534 remove the NE5534 and then look again on pin4 ? check also the pins 7 from the 4093 and 4066

look at the png, orange = +batt
red= +5volt
bleu= -5volt
green= ground

there can be some small differents with you board...and I just made it so not checked !!

[pavlos_x]

RED ISN'T REALLY MY COLOUR BUT.... ))
You need to have -5v on pin 4 from the NE5534 remove the NE5534 and then look again on pin4 (REMOVED 5534 4.20V) ? check also the pins 7 from the 4093 and 4066 (ALSO 4.20V FOR BOTH) WHEN 5534 IS ON 4093 AND 4066 1.88V.

look at the png, orange = +batt
red= +5volt
bleu= -5volt
green= ground

now for the board you send me. orange is 12.48v all of them are ok
for red all of them are +5v
and for the blue where i think the problem is we only have two places that i have -5.07. the rest are 3.36v and 1.86

http://i1161.photobucket.com/albums/...vlos_x/srf.png

[pavlos_x]

[ApBerg]

Think your NE5534 is not with us anymore.....test it with a new one

[pavlos_x]

and its the only part i didn't buy today oh well tomorrow, are we sure thought? is there another way to check it?

[silverdog]

between 7660 pin 5 and R5 is a direct track

how can one end be -5v and the other +1.86v ?

[pavlos_x]

this is the reading i get, i've checked it so many times, am wondering the same thing. what do you think the problem is silverdog?

[Qiaozhi]

between 7660 pin 5 and R5 is a direct track

how can one end be -5v and the other +1.86v ?

this is the reading i get, i've checked it so many times, am wondering the same thing. what do you think the problem is silverdog?

Maybe the lower end of R5 is not connected.

[pavlos_x]

when i take out NE5534 the measure is 4.20v, when on is 1.86v. R5 is connected, i tried again gluing it but is the same result.

[Qiaozhi]

when i take out NE5534 the measure is 4.20v, when on is 1.86v. R5 is connected, i tried again gluing it but is the same result.

I think both Silverdog and I read your post to mean that the 4.2V and 1.86V measurements were at each of a segment of PCB track. Now I see these voltages depend on whether the NE5534 is in circuit or not. In that case, either the NE5534 or ICL7660 is most likely faulty.

[pavlos_x]

ok i will check to see if i find these two but most likely the shop where i live won't have so am gona have to wait for Silverdog to send me from uk. i'll let u know, thank you both
am hoping for good results cheers

[ApBerg]

when i take out NE5534 the measure is 4.20v, when on is 1.86v. R5 is connected, i tried again gluing it but is the same result.

Think you mean minus -4.2volt ! check this, all the bleu track has to be the same voltage.. if not check the tracks if broken or if it has a solderbrige's

[pavlos_x]

no is +4.2 without 5534 on, and +1.86 with 5534 on.i know it should be minus but the soldering looks good, tracks are fine, i checked it too many times.

i don't know why this happens, does 5534 somehow can output negative voltage?